Flexible corrugated wrapping sheet



Aug. 7, 1956 A. DOWD FLEXIBLE CORRUGATED WRAPPING SHEET Filed Sept. 17, 1953 |-3 2 9 Fig. l

ATTORNEYS United States Patent 2,758,047 FLExiBLE CORRUGATED wRAPriNG SHEET Alfred Down, warcestr, Mass. Kpplication September 17, 1953, Se'rial No. 380,804

2 Claims. Cl. 154-55 This invention relates to a novel and highly flexible compound wrapping sheet including one or more paperboard corrugated strips each faced on both sides with facing sheets and all united into a single compound wrapping unit. The primary object of the invention resides in the production of a wrapping sheet of this nature which will flex so freely at all points and in all directions that it can be freely and intimately wrapped about irregular contours and surfaces and thereby serve more eificiently in the packaging and protecting of various delicate objects and surfaces during shipment and storage.

The corrugated strip of my improved wrapping sheet provides body and support and the facing sheets are preferably of such soft and flexible composition as to provide maximum contact protection to polished and like surfaces. The corrugated strip is rendered flexible by closely disposed indentations breaking up the U-shaped flutes which would otherwise and normally prevent folding of the strip transversely of the flutes. The facing strips are furthermore loosely secured to the corrugated strip by widely spaced lines of adhesive extending longitudinally of the strip and adhesively securing the facing strips to the flute crowns of the corrugated strip in narrow paths along such lines, the relatively wide areas of the facing strips between said paths being unattached to the corrugated strip and serving together with the indentations to give great flexibility to the wrapping sheet and permit intimate folding and wrapping thereof about irregular contours and surfaces. The production of a novel and improved wrapping sheet of this nature and for the purpose described comprises a further object of the invention.

These and other features of the invention will be best understood and appreciated from the following description of preferred embodiments thereof selected for purposes of illustration and shown in the accompanying drawings in which:

Fig. 1 illustrates a flexible corrugated wrapping sheet embodying the invention,

Fig. 1 is an enlarged fragmentary view of the sheet,

Fig. 2 is an edge elevation thereof.

Fig. 3 is a sectional view taken on line 33 of Fig. 1,

Fig. 4 is a view like Fig. 2 and showing a double corrugated sheet,

Fig. 5 is a similar view showing a triple corrugated sheet, and

Fig. 6 illustrates the high flexibility and protective character of the sheet.

My improved wrapping sheet 10 comprises a strip 12 of paperboard corrugated into flutes 14 extending transversely of the strip and two facing strips 16 of relatively thinner and more flexible paper in face to face contact with the two faces of the corrugated strip. The object of the invention is to provide such a compound wrapping sheet that will be so flexible in all directions that it can be wrapped as freely and intimately about irregular contours and surfaces as ordinary wrapping paper whereby to serve its packaging function more efliciently.

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Corrugated board will readily fold along the flute lines but not transversely thereof and, for the purpose of correcting this deficiency and rendering the board foldable transversely, Lindent along closely spaced lines 18 the crowns of the flutes facing in one direction. The flutes facing in the opposite direction can be likewise indented if more flexibility is required. It will be apparent that such closely spaced indentations so break up the flutes at their crowns that the board will readily break and fold at the indented locations, thus rendering the board universally flexible in all directions.

The facing strips 16 are preferably of soft and flexible composition and they are so loosely attached to the corrugated strip as to cooperate with the indentations 18 to render the combined unit highly flexible for wrapping purpose. As illustrated in Fig. 1, each facing strip is adhesively attached to the crowns of the corrugated strip in narrow paths along widely spaced lines 20, the relatively wide areas of the facing strips between the paths being unattached and loose and serving together with the indentations to give flexibility to the wrapping sheet and permit intimate folding and wrapping of the sheet about irregular contours and surfaces. The adhesive lines 20 extend longitudinally of the corrugated strip in substantially parallel zigzag paths with the outer apices 23 of each outermost line closely approaching its margin of the strip, each line crossing several corrugation crowns between adjacent apices thereof and the angle subtended by each outermost line inwardly of each outer apex 23 therein being an obtuse angle. This arrangement serves to attach the facing strip to the corrugated strip closely adjacent to and intermediately of the margins thereof and leaves a substantially loose facing strip portion between adjacent outer apices 23 along each marginal portion of the combined strips, thus providing substantially greater flexibility in the final product, and requiring less lines of adhesive than would otherwise be required.

The corrugated strip 12 gives body and support to the sheet and provides the cushioning effect necessary to support delicate products and prevent breakage, and the soft facing strips reinforce the corrugated strip and provide protection against the marring and scratching of polished and like finished surfaces enclosed within the sheet. The breaking of the flutes at 18 and the loose attaching of the facing strips at 20 combine to render the sheet extremely flexible and permit the close and intimate wrapping of objects varying widely in contour. For example, as illustrated in Fig. 6, the delicate vase 22 can be wrapped so intimately within the sheet that it is fully protected against shock and breakage and its exterior surface is protected by contact of the relatively soft facing sheet.

If a heavier wrapping sheet is desired, an additional corrugated strip 24 and additional facing strip 26 can be added, as illustrated in Fig. 4, to provide a double weight product. A triple weight sheet can be provided in like manner by adding a further corrugated sheet 28 and facing strip 30 as illustrated in Fig. 5.

Having thus disclosed my invention what I claim as new and desire to secure by Letters Patent is:

1. A compound flexible wrapping sheet, comprising a strip of paperboard of continuously uniform thickness corrugated into flutes extending transversely across the strip and alternately disposed U-shaped in opposite directions, the crowns of the flutes facing in one direction being indented along closely spaced lines extending longitudinally of the strip, two plane facing strips of relatively thinner and more flexible paper in face-to-face contact with the two faces of the corrugated strip, and widely spaced lines of adhesive extending longitudinally of the corrugated strip and adhesively securing the facing strips to the crowns of the corrugated strip in narrow paths along said lines, the relatively Wide areas of the facing strips between said paths being unattached to the corrugated strip and serving together with the indentations to give flexibility to the wrapping sheet and permit intimate folding and wrapping thereof about irregular contours and surfaces, said lines of adhesive extending longitudinally of the strip in substantially parallel zigzag paths with the outer apices of each outermost line closely approaching its margin of the strip, each line of adhesive crossing several corrugation crowns between adjacent apices thereof and the angle subtended by each outermost line inwardly of each outer apex therein being an obtuse angle.

2. The wrapping sheet defined in claim 1 in which the crowns of the flutes facing in both directions are indented along closely spaced lines extending longitudinally of the strip.

UNITED STATES PATENTS OBrien Oct. 1, 1929 Hanson Aug. 27, 1935 George Jan. 14, 1936 Rudin et a1. Sept. 22, 1936 Parsons Oct. 11, 1938 MeKeage Aug. 26, 1941 Ives Aug. 15, 1950 Draheim Aug. 15, 1950 Bode Nov. 27, 1951 Brown Aug. 2, 1955 

1. A COMPOUND FLEXIBLE WRAPPING SHEET, COMPRISING A STRIP OF PAPERBOARD OF CONTINUOUSLY UNIFORM THICKNESS CORRUGATED INTO FLUTES EXTENDING TRANSVERSELY ACROSS THE STRIP AND ALTERNATELY DISPOSED U-SHAPED IN OPPOSITE DIRECTIONS, THE CROWNS OF THE FLUTES FACING IN ONE DIRECTION BEING INDENTED ALONG CLOSELY SPACED LINES EXTENDING LONGITUDINALLY OF THE STRIP, TWO PLANE FACING STRIPS OF RELATIVELY THINNER AND MORE FLEXIBLE PAPER IN FACE-TO-FACE CONTACT WITH THE TWO FACES OF THE CORRUGATED STRIP, AND WIDELY SPACED LINES OF ADHESIVE EXTENDING LONGITUDINALLY OF THE CORRUGATED STRIP AND ADHESIVELY SECURING THE FACING STRIPS TO THE CROWNS OF THE CORRUAGTED STRIP IN NARROW PATHS ALONG SAID LINES, THE RELATIVELY WIDE AREAS OF THE FACING STRIPS BETWEEN SAID PATHS BEING UNATTACHED TO THE CORRUGATED STRIP AND SERVING TOGETHER WITH THE INDENTATIONS TO GIVE FLEXIBILTY TO THE WRAPPING SHEET AND PERMIT INTIMATE FOLDING AND WRAPPING THEREOF ABOUT IRREGULAR CONTOURS AND SURFACES, SAID LINES OF ADHESIVE EXTENDING LONGITUDINALLY OF THE STRIP IN SUBSTANTIALLY PARALLEL ZIGZAG PATHS WITH THE OUTER APICES OF EACH OUTERMOST LINE CLOSELY APPROACHING ITS MARGIN OF THE STRIP, EACH LINE OF ADHESIVE CROSSING SEVERAL CORRUGATION CROWNS BETWEEN ADJACENT APICES THEREOF AND THE ANGLE SUBTENDED BY EACH OUTERMOST LINE INWARDLY OF EACH OUTER APEX THEREIN BEING AN OBTUSE ANGLE. 